跳至内容 跳至搜索
方法
D
I
P
Q

常量

ID_ATTRIBUTE_METHODS = %w(id id= id? id_before_type_cast id_was id_in_database id_for_database).to_set
 
PRIMARY_KEY_NOT_SET = BasicObject.new
 

实例公共方法

dangerous_attribute_method?(method_name)

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 73
def dangerous_attribute_method?(method_name)
  super && !ID_ATTRIBUTE_METHODS.include?(method_name)
end

instance_method_already_implemented?(method_name)

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 69
def instance_method_already_implemented?(method_name)
  super || primary_key && ID_ATTRIBUTE_METHODS.include?(method_name)
end

primary_key()

定义主键字段 - 可以子类中覆盖。覆盖将否定 primary_key_prefix_type 设置的任何影响,不过。

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 80
def primary_key
  reset_primary_key if PRIMARY_KEY_NOT_SET.equal?(@primary_key)
  @primary_key
end

primary_key=(value)

设置主键列的名称。

class Project < ActiveRecord::Base
  self.primary_key = 'sysid'
end

你也可以自己定义 primary_key 方法

class Project < ActiveRecord::Base
  def self.primary_key
    'foo_' + super
  end
end

Project.primary_key # => "foo_id"
# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 130
def primary_key=(value)
  @primary_key = if value.is_a?(Array)
    @composite_primary_key = true
    include CompositePrimaryKey
    @primary_key = value.map { |v| -v.to_s }.freeze
  elsif value
    -value.to_s
  end
  @attributes_builder = nil
end

quoted_primary_key()

返回主键名称的引用版本。

# File activerecord/lib/active_record/attribute_methods/primary_key.rb, line 91
def quoted_primary_key
  adapter_class.quote_column_name(primary_key)
end